Process log Status of working Monitor data during EP & Rinsing process Comparison of EP1

Period : 2012/2/23 ~ 2/27Process : Degreasing (FM-20, 2%) [4hours], EP1(20μm, 50mA/cm2),

Normal 1st Water Rinsing [60min], Degreasing (FM-20, 2%) [30min], HPR [1 hour]

Preparation :Attachment to jigsWorkers : M. Sawabe, Kirk (KEK),

K. Nakamura, F. Tsukada, T Kitajima (Assist Engineering Co.),

Kirk1STF Cavity Group Meeting

@2012/3/5

MHI#15号機の３回目のEP1

• Degreasing (4 hours)• FM-20 (2%)• EP液の汚染防止のため事前に行って汚れを落としておく

• EP acid (2/24のサンプルを使用 )• Nb ingredient : 10.2g/ℓ• HF ingredient : ? g/ℓ (全体 61.5g/ℓの 65%が反応に使われる )• Al ingredient : ? mg/ℓ• Current density : ～ 50mA/cm2 (EP1の時は通常の電流密度で行う )

• Cavity surface temperature : <40℃• Control Voltage : 温度と電流密度を見ながら制御• Water mist blowing around upstream beampipe

• With normal N2 gas flow during extracting EP acid (8ℓ/min)

• 1st water rinsing (1 hour)• 10min (storing)/3min (flushing)で行う

• Degreasing (30 min)• FM-20 (2%)

• HPR (1 hour)• 60min (4 turns, w/o blind flanges)

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Condition of EP & Rinsing

STF Cavity Group Meeting @2012/3/5

Process log ①

STF Cavity Group Meeting @2012/3/5

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2/22 9:00 MHI#15 is moved to EP area 9:35 Degreasing starts before EP113:35 Degreasing finishes / Drying in CP area

2/23 9:00 Attachment of jigs for EP 9:32 Set cavity to EP bed with crane 9:47 Installation of cathode bar to cavity [O.K.]10:50 EP preparation ready10:55 Meeting for tomorrow’s working procedure12:00 fin.

2/24 9:33 Cavity rotation starts 9:38 EP acid flow starts 9:57 EP1 starts11:02 EP1 stops [1h05m] / Idling rotation (3 rpm / 20min) / Plastic case detachment11:22 Idling rotation stops

EP acid is removed from cavity with N2 gas flow(0.020MPa)11:36 First rinsing with ultra pure water starts12:47 First rinsing with ultra pure water stops [1h00m]

Detachment of restriction jigs / Data logger detached13:00 Un-installation of cathode bar from cavity / washing cathode bar (Sulfur exists!)

transferring cavity from EP bed to wagonDetachment of jigs for EP / Detaching every blind flange of teflon/ Checking inside cavity (No mark) / Checking teflon surface (No mark)

13:35 Shower rinsing @CP area / Checking inside cavity (Sulfur smell)14:00 Degreasing starts (FM-20, 2%) [30min]14:30 Degreasing finishes14:40 Taking sample around beampipe15:00 Transferring cavity from wagon on turntable for HPR using crane15:03 Checking tolerance between position of nozzle and center of beam pipe15:04 HPR for inside cavity starts16:08 HPR for inside cavity stops [0h54m]16:10 fin

2/25 9:00 move MHI#15 to inspection room

Process log ②

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STF Cavity Group Meeting @2012/3/5

Status of 3rd EP1 for MHI#15 ①

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current

voltageTcavity

Treservoir

Troom

Tcavity

average current density EP1の場合は通常通り 50mA/cm2で行う。途中で１回ジャンプしているのは、電圧を 20V前後で調整していたことによる。

STF Cavity Group Meeting @2012/3/5

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Status of 3rd EP1 for MHI#15 ②左図は平均電流密度と電圧の相関右図は定常状態での分布

MHI#17の EP1の結果はドリフトの効果が大きい。MHI#18以降は EP液が新しくなったため、振れ幅が大きい。MHI#15号機の３回目の EP1はドリフトの効果が大きい。

最近の EP1の定常状態の比較Cavity Mean temp.

[℃]R.M.S. temp. [℃] Mean i

[mA/cm2]R.M.S. i [mA/cm2]

MHI#14 1st 30.9 0.5 47.0 1.7

MHI#15 1st 30.9 0.8 47.2 1.5

MHI#16 1st 32.8 1.2 46.3 1.5

MHI#17 1st 33.0 0.7 46.6 1.9

MHI#14 2nd 33.3 0.2 46.9 1.1

EP液交換

MHI#18 1st 36.3 1.2 46.7 2.4

MHI#19 1st 34.0 0.7 46.4 2.4

MHI#15 2nd 35.0 0.4 46.1 2.5

MHI#16 2nd 35.5 0.5 46.1 2.4

MHI#20 1st 32.1 0.8 46.3 2.3

TOS#2 1st 33.0 0.4 46.2 2.1

MHI#21 1st 33.9 0.6 47.6 2.0

MHI#22 1st 35.4 0.6 46.9 1.6

MHI#15 3rd 32.5 1.2 42.1 2.9

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Status of 3rd EP1 for MHI#15 ③

STF Cavity Group Meeting @2012/3/5

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#1 #2 #3 #4 #5 #6 #7 #8 #9 #10

EP1の間の空洞表面温度の状況。

#11

#12

Status of 3rd EP1 for MHI#15 ④

STF Cavity Group Meeting @2012/3/5

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#1 #2 #3 #4 #5 #6 #7 #8 #9 #10

EP1の間の空洞表面温度の状況（前ページの最後の拡大図）。

#11

#12

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#1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11

#12

Status of UWR for MHI#15 ①

STF Cavity Group Meeting @2012/3/5

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一次洗浄中の空洞温度の状況（前ページの拡大図）

#1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11

#12

Status of UWR for MHI#15 ②

Status of UWR for MHI#15 ③

STF Cavity Group Meeting @2012/3/5

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STF Cavity Group Meeting @2012/3/5

Status of HPR for MHI#15

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